Year	Percent
1990	0.95528
1991	0.89938
1992	0.89591
1993	0.8713
1994	0.8489
1995	0.87964
1996	0.84608
1997	0.82166
1998	0.80077
1999	0.78392
2000	0.76342
2001	0.99177
2002	0.97479
2003	0.95896
2004	0.72095
2005	0.70111
2007	0.94001
2008	0.92347
2009	0.90989
2010	0.89625
2011	0.88366
2012	0.87578
2013	0.8678
2014	1.98278
2015	1.96777
2016	2.02228
2017	2.58713
2018	2.71812
2019	3.00047
2020	3.28197